Hello Daria,
do not understand the business need...
Why having a leadtime after Bid Invitation validated to publish it?
Workflow on RFx is triggered when you click onto "Publish" button, so when workflow will be over, RFx will be "released" that is to say "Published": this is the SAP standard design.
Anyway..., one solution could be to create a CUF field at Bid Invitation header level. This mandatory field will have to be populated with a date value by the Purchaser before publishing its RFx.
Then, approver will be allowed to approve (no restriction for rejection) the RFx only if day date is greater than or equal to CUF field date.
Regards.
Laurent.
